#!/bin/sh

cache=""$HOME"/.cache/mew_drun"
dirs="$HOME/.local/share/applications/ /usr/share/applications/"

build_cache() {
  find $dirs -type f -name "*.desktop" | \
    xargs -n1 basename | \
    sed 's/\.desktop$//' | \
    sort -u > $cache
}

check_cache() {
  [ -f "$cache" ] || build_cache

  for d in $dirs; do
    [ "$d" -nt "$cache" ] && return 0
  done

  find $dirs -type f -name '*.desktop' -newer "$cache" -print -quit | \
    grep -q . && return 0
  return 1
}

check_cache && build_cache

choice="$(mew < "$cache")"
gtk-launch $choice